Technical Information
70
Precision Induction Heating
MBRELL
®
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4—20mA Scale in “Amps” mode
Where Max Amps = Tap*25 (i.e., tap 22 would result in a full scale value of 22*25=550
amps.)
(Current in Amps)=(Aux_Out_mA - 4)*(Max_Amps)/16
mA output Amps
4 0
6 68.75
14 343.75
20 550
All EASYHEAT LI’s have a frequency range scaled to 140-410kHz.
0—20mA Scale in “Frequency” mode
In 0-20mA scale, Frequency_in_kHz=((Aux_Out_mA*13.5) +140.
For example, if Aux out is 3.59mA, then 3.59*13.5+140=188.46 kHz.
mA output Frequency in kHz
0 140
3 180.5
12 302
20 410
4—20mA Scale in “Frequency” mode
In 4-20mA scale, Frequency_in_kHz=(Aux_Out_mA-4) *(16.875) +140. For example, if
Aux out is 14.88mA, then (14.88-4)*(16.875) +140=323.6kHz.
mA output Frequency in kHz
4 140
7 190.6
16 342.5
20 410
Note: The Auxiliary Output is updated about three times a second when the heat is on,
under internal computer control. When mains power is first applied, there is an interval of
about a second during which the computer is coming out of reset. During this time,
approximately 35mA may be seen at the output.
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